Highly Toxic Gas
Highly Toxic Gas :
A chemical that has a median lethal concentration (LC50) in air of 200 parts per million by volume or less of gas or vapor, or 2 milligrams per liter or less of mist, fume, or dust, when administered by continuous inhalation for 1 hour (or less if death occurs within 1 hour) to albino rats weighing between 200 g and 300 g (0. 44 lb and 0. 66 lb) each. NFPA 1, 2003 ed
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